Antenna



FIG. 1 is a front, top perspective view of an antenna showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate portions of the antenna that form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 